Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece
and leave with the element ID LEGO asks for, or a link to buy the part.
Tile 1 x 4 with GrooveWhitePart 2431Element 6548255 or 243101×2
Tile Round 2 x 2 with Bottom CrossWhitePart 4150Element 415051 or 415001×2
Blue
12 pieces
Technic Axle and Pin Connector PerpendicularBluePart 6536Element 6261383 or 6178359×8
Technic Beam 1 x 5 ThinBluePart 32017Element 4254626 or 4125191×4
Yellow
11 pieces
Technic Beam 1 x 9 Bent (6 - 4) ThickYellowPart 6629Element 6524459 or 6375945×2
Technic Engine Piston RoundYellowPart 2851Element 4112203 or 285124×8
Technic Plate Rotor 3 Blade with Smooth Ends and 6 Studs (Propeller)YellowPart 32125Element 4125199×1
Trans-Clear
10 pieces
Technic Engine Cylinder with Side SlotsTrans-ClearPart 2850aElement 4109610×8
Technic Shock Absorber 10L, Damped, Normal SpringTrans-ClearPart 76320c01Element 4142095×2
Metallic Silver
4 pieces
Wheel 81.6 x 34 ZR Three Spoke SwirlMetallic SilverPart 32197Element 4124086×4
[No Color/Any Color]
1 piece
Sticker Sheet for Set 8448-1[No Color/Any Color]Part 22302Element 4125165×1
Tick each piece as you find it, or mark it missing.
When a piece really is missing
Ask LEGO
LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for
the set number and each piece's element ID, the number printed beside the piece in the parts list at the back
of the instructions. This checker lists both.
Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from
older or second-hand sets.
Keep a record
Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick
pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.